Home / 20,369.80-28,111.62-13,315.24

Finding the Fourth Proportional to 20,369.80, 28,111.62 and 13,315.24

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Solution

The fourth proportional to 20,369.80, 28,111.62 and 13,315.24 is: 18,375.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,369.80 : 28,111.62 = 13,315.24 : x
  2. Step 2: Convert to fraction form
    20,369.80/28,111.62 = 13,315.24/x
  3. Step 3: Cross multiply
    20,369.80x = 28,111.62 × 13,315.24
  4. Step 4: Simplify right side
    20,369.80x = 374,312,967.09
  5. Step 5: Solve for x
    x = 374,312,967.09/20,369.80
  6. Step 6: Final answer
    x = 18,375.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.